latch for Milgard window

A quick learner from Los Angeles says:
I'm having trouble identifying the latch/lock part of some Milgard windows. They were installed around 2004, can't see any part number anywhere. I'm missing one of the handles of a permanently locked window.
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Bob from SWISCO responded:

I think this might be either our 38-099 or 38-100, but removing it to confirm would be best. You may need a pro to help you do this if the lock has become jammed. 

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